1. White House Office of National Drug Control Policy. Epidemic: responding to America’s prescription drug abuse crisis. Washington, DC, 2011. http://www.whitehousedrugpolicy.gov/publications/pdf/rx_abuse_plan.pdf . Accessed 19 Feb 2014.
2. United Nations Office on Drugs and Crime. The non-medical use of prescription drugs, policy direction issues, n.d. http://www.unodc.org/unodc/en/drug-prevention-and-treatment/non-medical-use-prescription-drugs.html . Accessed 12 May 2014.
3. Substance Abuse and Mental Health Services Administration. Results from the 2011 National Survey on Drug Use and Health: Summary of National Findings. NSDUH Series H-44. Rockville, MD: Substance Abuse and Mental Health Services Administration, 2012. http://www.samhsa.gov/data/nsduh/2k11results/nsduhresults2011.htm . Accessed 03 April 2014.
4. Birnbaum HG, White AG, Schiller M, et al. Societal costs of prescription opioid abuse, dependence, and misuse in the United States. Pain Med. 2011;12:657–67.
5. Mark TL, Woody GE, Juday T, et al. The economic costs of heroin addiction in the United States. Drug Alcohol Depend. 2001;61:195–206.